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Additional rules and regulations for residential Mail Boxes as stated in the USPS document DMM 508 are:

3.1 Basic Information for Customer Mail Receptacles
3.1.4 Clear Approach
Customers must keep the approach to their mailboxes clear of obstructions to allow safe access for delivery. If USPS employees are impeded in reaching a mail receptacle, the postmaster has the authority to withdraw delivery service from that address.

3.2 Curbside Mailboxes
3.2.1 Manufacturer Specifications
Manufacturers of all mailboxes designed and made to be erected at the edge of a roadway or curbside of a street and to be served by a carrier from a vehicle on any city route, rural route, or highway contract route, must obtain approval of their products under USPS Standard 7, Mailboxes, City and Rural Curbside. To receive these construction standards and drawings or other information about the manufacture of curbside mailboxes, write to USPS Engineering.

3.2.3 Locked Mail Box Design
Mailbox designs that provide security for customer's in-coming mail will be classified as "Locked Mailboxes." Although the shape and design is less restrictive, locked mailboxes must meet the same applicable functional requirements. Designs having a slot for in-coming mail must be at least 1.75 inches high by 10 inches wide. If a slot has a protective flap it must operate inward to ensure mail can be inserted in a horizontal manner without requiring any additional effort of carriers. A mailbox with a lock must have a slot that is large enough to accommodate the customer’s normal daily mail volume and receive US Priority Envelopes without the need to be folded.

3.2.4 Mailbox Post
The post or other support for a curbside mailbox must be neat and of adequate strength and size. The post may not represent effigies or caricatures that tend to disparage or ridicule any person. The box may be attached to a fixed or movable arm.

3.2.6 Location
Subject to state laws and regulations, a curbside mailbox must be placed to allow safe and convenient delivery by carriers without leaving their vehicles. The box must be on the right-hand side of the road in the direction of travel of the carriers on any new rural route or highway contract route, in all cases where traffic conditions are dangerous for the carriers to drive to the left to reach the box, or where their doing so would violate traffic laws and regulations.

3.2.7 Address Identification
Every curbside mailbox must bear the following address information:
A box number, if used, inscribed in contrasting color in neat letters and numerals at least
1 inch high on the side of the box visible to the carrier’s regular approach, or on the front door if boxes are grouped.
A house number must be displayed if street names and house numbers have been assigned by local authorities and the postmaster authorizes their use as a postal address. If the box is on a different street from the customer’s residence, the street name and house number must be inscribed on the box.

3.2.8 Owner’s Name
The mailbox may bear the owner’s name.

3.2.9 More Than One Family Sharing a Receptacle
If more than one family wishes to share a mail receptacle, the following standards apply:
Route and Box Number Addressing. On rural and highway contract routes authorized to use a route and box numbering system (e.g., RR 1 BOX 155), up to five families may share a single mail receptacle and use a common route and box designation. A written notice of agreement, signed by the heads of the families or individuals who want to join in the use of such box, must be filed with the postmaster at the delivery office.

3.2.11 Newspaper Receptacle
A receptacle for newspaper delivery by private carriers may be attached to the post of a curbside mailbox used by the USPS if the receptacle: a.) Does not touch the mailbox or use any part of the mailbox for support. b.) Does not interfere with the delivery of mail, obstruct the view of the mailbox flag, or present a hazard to carrier or vehicle. c.) Does not extend beyond the front of the mailbox when the box door is closed. d. Does not display advertising, except the publication title.

3.3 Wall-Mounted Centralized Mail Receptacles
3.3.1 Manufacturer Requirements
Manufacturers of wall-mounted centralized mail receptacles used for mail delivery must receive approval under the specifications and procedures in USPS Standard 4. The specifications and other information can be obtained by writing to USPS Engineering.

3.3.2 Customer Requirements
The installation of proper delivery equipment is required for delivery service. The type of equipment must be approved by the USPS under 3.3.1 and must be appropriate for the structure. Customers should discuss the types of approved equipment permitted for their structures with their postmaster before purchasing and installing delivery equipment.

View the complete Standards Governing the Design of Curbside Mailboxes

Reference USPS Guide ID: 10000000002388448Guide created: 11/27/06 (updated 12/23/09)
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United States Postal Service Regulations regarding Mailboxes
The United States Postal Service places rules and regulations on mailboxes and posts so that your mail and their mail carriers stay safe.

Installation requirements for residential curb-side Mailboxes include:
  • Mailboxes should be placed on the right-hand side of the road in the direction that the mail carrier is traveling. Occasionally special circumstances may override this regulation.
  • New mailbox designs must have an in-coming mail slot at least 10" wide to accommodate priority envelopes without folding.... read full regulation.
  • Mailboxes have to be placed in compliance with state laws and highway regulations. All roadside mailboxes must be able to be accessed without the mail carrier having to leave their vehicle.
  • Curbside mailboxes must have the box or house number displayed with at least 1” high numbers or larger on the front or flag side of the mailbox.... read full regulation.
  • Mailboxes must be 6-8” from the curb and the door or slot must be 41-45” from the ground.
  • The USPS carrier neither opens a locked box nor accepts a key for this purpose.
  • These Regulations are basic but special circumstances may exist; therefore, if you have any questions, it is highly recommended that you check with your local Post Office.
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